Adding gallery via DEMO2 method fails

[rawzone]

When I try to inset a gallery via the method used in DEMO-2 it seems like the attachment info is not getting parsed by the javascript.

I tried to access the wp.media.gallery.attachments and that seems to return the IDs of the photos selected, but I can't wrap my head around saving the IDs and remembering them when wanting to edit the "gallery" selection of photos.

Do you know of any workaround to get this newer gallery function to work with this?

Wordpress version: 3.9